If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects ...

The Arduino platform offers a variety of affordable toys used by DIY enthusiasts for simple electronics projects. It is known for being easy to learn and is built on a variant of the C++ ...

But what can you do if you don’t have these tools on hand? [Andrew Moser] has a method that lets you pull it off with an Arduino and an LM339 quad comparator. The circuit works by feeding a ...

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